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Welcome to HTS! :wave:

You should answer a couple honest questions before we can help you the best. 1) Are you limited to using the drivers that you were given? 2) Is your goal a functioning first DIY speaker project, or is your goal to put a lot of time and work into making something that sounds superb?

For a DIY speaker system you need to have not only T/S parameters of the woofer, but also full range frequency response and impedance data for the drivers that you are wanting to use. Designing a crossover at the very least takes several hours of simulation and tweaking, and that's if you happen to have a set of drivers that play nice. If you answer no to question 1 and agree with the first option of question 2, it is still possible to continue onward and make a speaker system with what you have.
 

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What DrDyna said is exactly right, re-using another crossover will indeed function as a speaker but with varied results that will never purpass marginal. The "2500 Hz" crossover point is only valid for the original drivers, it would ahve to be simulated (a decent amount of work) using the exact crossover component values in order to see what it would be like for your drivers.

Yikes, so I was just looking at the specs of your 8" GRS driver. Having a Qts that high, it is not going to model very well. It would be best off in a large sealed box (1cuft or bigger). Going vented the box would need to be very large and even then the response is not what an ideal response looks like (3cuft @ 30Hz, 3"x5" round port). If you go sealed, fill fully with stuffing. If vented, line the walls with foam.

If you insist on continuing, take your pick from either of those alignments. Not designing and simulating a proper crossover is your choice as long as you understand the caveats, hopefully it will inspire you to try it in the future :) Without a crossover design, you won't need to worry about the dimension of your baffle (front speaker panel). You should make sure to mount your woofer and tweeter as close together as possible, and it's also better to mount the tweeter off-center, then mirror your left and right sides. Just put the tweeter so high off the ground as to be right at listening height.

Do you have ANY info at all on the tweeter? I am thinking that it may help your effort to add in a zobel for the woofer and perhaps some attenutation on your tweeter. It's guess work but it could help you integrate your previously used crossover.
 

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